Mining machine



Oct. 16, 1945. A. L. LEE

MINING MACHINE Filed Nov. 4, 1943 4 Sheets-Sheet 1 /N\/EN7'0/ AETHUE L.LEE,

0st. 16, 1945. A. L LEE MINING MACHINE Filed Nov. 4, 1943 4 Sheets-Sheet2 //v vE/ /To/e AETHUR L. LEE,

-W NBY I I m ATTY @d. 16, 1945. LEE 2,387,159

MINING MACHINE Filed Nov. 4, 1943 4 Sh'eets-Sheet 3 I ///VE/\/7'OE:ARTHUR L LEE,

Oct. 16, 1945.

Filed Nov. 4, 1943 4 Sheets-Sheet 4 7 D m .i I m 1/. 5 [Ill 0 {M W O I 1A J 1/ 1/ J r m mu m M rm L Q l 4/ m A v 5 8 O O I o\ m I/NVENTOE:ARTHUR L. LEE, BY 71M;

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Patented Oct. 16, 1945 MINING MACHINE Arthur L. Lee, Upper Arlington,Ohio, assignor to The Jeffrey Manufacturing Company, a corporation ofOhio Application November 4, 1943, Serial No. 508.929

10 Claims.

This invention relates to a mining machine.

An object of the invention is to provide a kerf cutting type miningmachine with improved mounting preferably involving pneumatic tiredwheels for propelling and steering the mining machine.

Another object of the invention is to provide improved drive earing fortraction means of a mining machine.

A further object of the invention is to provide an improved relation ofparts in a mining machine involving traction wheels in which thetraction wheels, at least on one side, are within the lateral dimensionsor confines of the mining machine main frame.

Another object of the invention is to provide an improved steering wheelconstruction for a mining machine.

Still another object of the invention is to pro vide an improved drivegearing involving particularly differential drive mechanism for a miningmachine or like vehicle.

Other objects of the invention will appear hereinafter, the novelfeatures and combinations being set forth in the appended claims.

In the accompanying drawings,

Fig. 1 is a plan view of a mining machine incorporating the features ofmy invention;

Fig; 2 is a side elevational view of the machine of Fig. 1;

Fig. 3 is a sectional elevational view through the dual traction wheelsand associated parts on one side of the mining machine, taken along line3-3 of Fig. 2;

Fig. 4 is a sectional elevational view taken on the line 4-4 of Fig. 2looking in the direction of the arrows;

Fig. 5 is a sectional elevational view taken on the line 5-5 of Fig. ,1looking in the direction of the arrows; and

Fig. 6 is a sectional view taken on the line 6-6 of Fig. 1 looking inthe direction of the arrows with certain parts shown in elevation ratherthan in section in the interest of clearness.

The mining machine herein disclosed is a modification of, andimprovement on that disclosed in the patent to R. K. Jefirey et al.,2,263,779,'for a Mining machine, dated November 25, 1941.

Briefly described, the mining machine includes" a main frame It adjacentthe forward end of which there is a turntable H which is mounted forswinging movement about an upright axis and which is swung by a pair ofhydraulic piston motors i2, the cylinders of which are formed as anintegral part of the main frame ill.

Mounted on the turntable II and pivotally attached to the rear thereofon a horizontal axis is a supplemental frame l3 which carries anelectric motor H for driving the chain of the cutter mechanism, ashereinafter described.

Formed as an integral part of the supplemental frame 13 is a downwardlyextending elongated neck I5 upon which a turnover head I6 is mounted,said head 16 being adjustable about the axis of the neck l5 and alsobeing pivotally mounted on said neck l5 for adjustment along atransverse axis which is parallel to the plane of a forwardly extendingcutter bar I! which is supported by the turnover head I8 for swingingmovement about an axis which is at right angles to the plane of the saidcutter bar II.

The swinging movement of the cutter bar l1 about the two axes abovedescribed, which are at right angles to each other, is provided byvirtue of hydraulic piston motors |8, as to the said parallel axis; andl9, ID as to the said right angle axis. The cutter bar I! carries anendless cutter chain 20 provided with appropriate cutter bits. Saidchain 20 is driven through drive mechanism from the motor M, asdisclosed in detail in the abovementioned patent to R. K. Jeffrey,

et a1.

Swinging movement of the supplemental frame [3 about its rear pivotalaxis provided by the pivots 2| is provided by a pair of spaced hydraulicpiston motors 22, 22. All of the piston motors above described arepreferably of the double acting typ The above mentioned patent to R. K.Jeffrey et a1. discloses a machine adapted to operate on the rails of amine track. This machine has been modified in ,a number of importantparticulars and is so constructed as to be mounted on pneumatic tiresand many of the features of my invention relate to construction whichprovides for this difference in operation.

Attention is directed now particularly to Figs. 1, 2 and 3' of thedrawings and to the construction of the front dual traction wheels whichsupport and propel the mining machine. Ex-

. tending downwardly from the top plate of the main frame Ill andforming a part of the main frame is a central bracket 23 (see Fig. 3)which is attached by machine screws to integral portions of the mainframe I 0. The bottom of the bracket 23 is provided with an integrallyformed shaft receiving pipe 24 which is welded to the vertical membersof the said bracket- 23. Extending through the pipe 24 is a shaft 25which is held in the pipe 24 against longitudinal movement of the shaft25 is similar that on one and alone will be descrlbed'in detail.

Each outer end of the shaft 25 supports a dual wheel designatedgenerally by the reference character 2'1 and each dual wheel Elincludesan elongated hub 28 which is journaled on the spindle of the shaft 25 byspaced anti-friction roller bearings 29 and .30. The hub 28 isremovablyheld on the spindle oi the shaft 25 by nut and washer assembly3!. The hub 28 is provided with a removable hub cap 32. 28 is a pair ofspaced split rims 33 and 34, the former being the inner rim and thelatter the outer rim. Rims 33 and 3,4 are provided with pneumatic tires35 and 36, ;respectively. 3%! is removably supported on the hub 28b aninner integral clamping ring 31; andone clamp:-

Mounted upon the hub assmeo by a bolt 28. Since the structure on eachend which constitutes another feature of my invention.

Attention is particularly directed to Fig. 4 oi the drawings and to thestructure of this differential drive mechanism. The difierentialmechanism indicated at 88 is removably attached as a unit to the mainframe In of the mining inachine and it includes a stationarydiiferential frame 49 formed of two parts which are removably attachedby a plurality of spaced machine .screws 513.

' tion differential cage and housing 53 whichis log surface of a doubleclamping; ring 38 which is slidable over the hub 28 and is preferablysplit along one radial plane to permitit to contract'under clampingpressure and have a tight fitlon the hub 28, The outer r'izn'fic isclamped between the other clamping surfaceof the ring 3? and a removableouter clamping ring 39 which is removably attached-to the hub 28 by'aplural ity of spaced lugs l0. The inner end of the hub 28 is providedwith an integral extension 4i upon which a drive sprocket or gear 612 isattached as l t Innate.- A greaseseal i3 is provided between extensionEl and a' stationar'y grease seal ring 44 which has a" tight lit withthe shaft 25 and is adjacen'tthe shoulder thereon and the inner'raceformed intwo parts, which parts are connected together by elongatedbolts 5% which also attach a ring gear or sprocket .55 to thediiierentlal cage or housing 53 which-acts as a driving gear or sprockettherefor. In the centralportion of the difierential cage 53 is a pair ofdiiierentiai bevel gears 58 and 51 which mesh with opposite sides of abevel gear 58 which is mounted on a pin 59 carried by the cage 53. This,of course, provides for the differential driving of individually splineddrive shafts Stand 6| which have a splined.

connectionwith the bevel gears 56 and 51, respectively. Each of theshafts 60 and BI is provided with s, rigidly attached hub 62. Welded toeach hub 62 is a plurality of pins 63 which extend of'the bearing 39.This provides a grease tight I enclosure within the hollow portion ofthe hub 28 to provide a grease chamber, insuring proper lubrication ofthe bearings 29 andSIl.

It is to be particularly noted; that since the sprocket or gear-42 is onthe inner end of the hub 28,-each of the rims 38 and 3d and theirassociated tires may be readily removed by the simple expedient ofremoving the lugs ill.

It may be further pointed out'that the extension l! is provided with adrip ring 45 which is formed integral-therewith and which provides agroove between it and the sprocket i 'which will catch oil from thechain associated with the sprocket 42 and drip it back onto the chain.

One of the problems which was encountered to provide the dual pneumatictired wheels for the mining machine was that of providing adequate tiresupport for the mining machine, particularly at its forward end wherethe weight is largely concentrated, and still not extend the tractionmeans appreciably beyond the lateral confines of the main frame. Byreference to Fig. l of the drawings it will be'noted that the outermosttir .36 does not extend laterally beyond the main frame as representedby the integrel piston motors i2 and the other tire 3% on the oppositeside of the machine will extend a like distance from the longitudinalcenter line of the forward part of said main frame it. In otherwords,the two front traction dual wheel assemblies 27 are symmetrical withrespect to the longitudinal axis of the main frame 663. It maybe statedthat the mounting of the sprocket or gear :32 on the inner end of thehub 28 contributes to this construction.

Each of the dual wheel assemblies 2! is separately dn'ven'in the sensethat'they may have individual independent movement and to this end eachof the sprockets i2 is driven by a chain 56 froman individual sprocketa? (see Fig. 4) of a differential drive mechanism, the structure of intoand have a loose driving fit with a plurality of holes in a hub of thepreviously mentioned sprocket or gear l! which is the driven gearinsofaras the differential mechanism'tfl is concorned. This provides a flexiblecoupling between each shaft 60, 6! and associated hub 64.

' \Also formed as an integral part of each hub 53 is a brake drum 65with which a brake mechanism $6 is associated. The brake mechanisms forthe dual wheels 27 on opposite sides of the vehicle are independentlyoperable by independent brake levers 61 (see Fig. 2) adjacent theoperator's station at the rear end of the machine. It is'to be' notedthat each of the hubs 64 is journaled on the outer end of thediiferential cage or housing 53 and as a consequence the pulling forceof the chain 36 is not transmitted to the shaft 50 but is taken directlyby this cage or housing 53. As a consequence, the shafts so and El arepurely torque transmitting shafts;

It is further to be noted that in the absence of any diiierential actionor, in other words, when each of the dual wheels 2? is travelingat thesame speed as when the machine is moving in a straight line, the hubs 83 and sprockets or drive gears 37. will not have any relative rotationwith respect to the cage extensions or outer parts upon which they arejournaled since the cage 53 will rotate as a unit with said sprockets orgears 4'1. However, where there is difierential action involved and oneof the dual wheels 21 rotates at a difierent rate than the other therewill be some slight rotation of the hubs 86 on their journals and thuswith respect to the outer portions or extensions of the cage or housing53. These journals, which are seen at 68, may be free-fioating or theymay be keyed to the hubs 65 as illustrated. "it is to be furthernotedthat an oil ring ase'mica a'thrust-ring ii on each of the'dr iveshaftsjiiil andfii does not have a tight fit with the adjacent shoulderon the cage 53 but permits oil to pass thereby from an oil receiving isformed within the difierential cage or housing now to bedescribed. H Thechamber l2'is provided with a feed port is which communicates with achamber 14 formed 53 and which is supplied with'oil in a-manner as apart ofthe framed!) of the differential'mechanism Q8; The chamber I I isclosed at its opposite ends'by oil seals 15 and 16 which cooperate withadjacent cylindricalsurfaces formed 'on the exterior of the housing orcage 53. It is, of course, evident that the anti-friction bearing'fii iswithin this chamber it and consequently it is lubricated by the oiltherein.

a'grcove formed withinflan integral portion of groove formed inaremovable plate 17 which is the'ir'amedil while the seal 16 isreceivedinaf attached to the frame 49& by spaced screws 18. Said plate'77 provides for'removal of the an'ti- Also formed as an integral pipeand chamber Hand in the chambers 12 and. id also lubricates other gears,bearings and'journals in a-manner now to be described.

The aforedescribed' bevel gears 56 and Ell are iourn'aled on spacedintegral webs 8i and'82 form.

ing a part of the cage 53 and there is a plurality of bores or ports 83which provide communicachamber 12 which 3 that the 'difierential cage isof unusual constructionbecause generally such a differential cagetogether with its associated ring gear is mounted in a totally enclosingdifierential housing which contains the oil or grease for lubricatingthe variousgears, bearings and other frictional parts, I a1so providewithin the differential mechanism d8 a-device for lubricating a drivechain 88 (see Figs. 1 and 2)" associated with the drive sprocket or geardi. Thislubricating construction is'intheform ofan oil chamber 89provided The seal 75 is con'tained in ly drips "at every slow rate onwith a removable plug Qtwhich chamber cornmunicates by way of anintegrally formed feed pipe 95 which terminates just above the sprocket15' with wool waste or the like so that the lubri- 55. lhe bottom of theoil chamber 89 is stuffed cating'oil which is preferablyifairly heavypasses through it in very small quantities and thus merethesprocket 5dand associated drive chain 88. I p j y 'Referringparticuiarly to Figs. 1and 2 of the drawings, it may be pointed out that the complete drivegearing for the dual wheels 21 extends from an electric motor 92 carriedon. the main From the above description tion to the central compartmentof the cage 53 it formed by these webs 8| and 82 so that the oil in thechamber'iZ is delivered to this'compart merit and thus lubricates thegears 56,51 and 58 together withtheir bearing surfaces; From' thiscentral compartment the oil is free tofiow by way of a plurality ofbores or'por-ts'M in the web 82 to another chamber 85. In a mannersimilar to that above described in connection with the flow of oil fromthe chamber [2 to the bores it, the oil inchamberlifimay flow to thebores is at the right hand end of the cagett as viewed in Fig. 4 of-thedrawings. Furthermore, there is another group of bores 86 leading fromthe chamber 85 to a chamber 87 within which the bearin 52 is housed andthus the'bearing 52 is also lubri cated. The housing Bl is provided-withappropriate grease seals and ring construction similar to that abovedescribed at 75, 16 and TI. It is thus evident that the lubricating oildelivered to the feed pipe and chamber l9 iubricates all of the bearingsurfaces within the cage and housing 53 and lubricat'es theanti-friction I bearings 5i and 52 as well as thejournais es. 7 It is tobe noted that in generalthe cageand housing 53'is an oil tight containerexcept for j sci frame It by way of a speed reducing gearing which isdisclosed in full detailin theabove mentioned patent to R. K. Jefirey.et al., and which ultimately leads to a sprocket 913 which is seen at gin said patent, which sprocket 93 drives the chain 86' which is guidedoveridler sprockets 9d and 95 and in tum drives the aforedescribed gearor sprocket 55. The sprocket 55 drives the cage 53 andin the absenceofanyjdifierential i action the sprocket 55, cage 53, shafts 60 and Bi andsprockets or gears i'i turn as a unittogether. The sprockets d? drivetheir, associated chains 56 which, as illustrated in Fig. 2 of thedrawings, have their upper runs guided by idler sprockets or rollers 96carried by the main frame in and which drive-the sprockets or gears d2associated with thedual wheels 21. During turning movement of theminingmachine when differential action is involved the shafts til andti, and their associated driving mechanisms, will rotate at differentspeeds.

vidual brake mechanisms 86 assist not only in the It is evident that theindistopping of the miningmachine but also in the turning thereof, inthat, whilethe vehicle is being turned, the brake on one side may beactuated to aid in thisaction. a

The principal steering action which may be aided by the braking actionabove described is accomplished by asinglesteering wheel mechanism 97,which is disclosed in detail in Fig. 5 of the drawings, and which issituated at-the extremerear end of the main frame l0. Referringparticularly to Fig. 5 of the drawings it will be seen that the steeringwheel mechanism 91inthose ports, bores or passageways which lead; to

other enclosing chambers or restrictd areas which are to be lubricated.Furthermore, it is to be noted that the central portion ofthe housing orcage 53 is not enclosed but is exposed since the bottomportion of theditferential frame dd is open, as clearly illustrated in Fig. i of thedraw times and to" lugs, to permit access thereto at all the drive chainassociated with the sprocket 55.

- Furthermore, the rear portion of this frame 69 is necessarily ofopen-construction to permit the drive chain to extend thereinto and meshwith the sprocket 55. In this particular, it is evident cludes a yoke eswhich at its top is provided with an integral stub shaft 99 mounted on avertical or upright axis which is preferably along the longitudinal axisof the main frame Ill. The stub shaft 99 is supported lamp and bottomantifriction bearings Hi6 and it! which are carried in a cap m which iswelded to and formed as an integral part of the main frame Ill. Theupper end of the shaft 99 carries a removable cap I03 attached theretoby spaced screws and which has a ring [Us used as an indicating deviceto indicate the alignment of a wheel we carried by the yoke 98. Alsoattached to the upper part of the yoke Qdis a large ring. gear it whichmeshes with an integral pinion i (ll formed on the lower end of therotor shaft of a rotary hydraulic motor I08. The gear its is enclosedwithin the housing formed by a top plate on the main frame I andsurrounding plate I09 which provides a heavy oil retaining compartmentfor lubricating the gears I06 and I01. The wheel I is provided with apneumatic tire H0 and since the structure of said wheel I05 is generallyconventional and is clearly illustrated in Fig. 5 of the drawings, nodetailed description thereof is believed necessary.

The hydraulic motor I08 is controlled by the hydraulic system which isdisclosed more completely in the above mentioned patent to R. K.Jeffrey, et al., and it may be operated in reverse directions under thecontrol of a reversible valve III (see Fig. 2) which is adjacent theoperator's station.

In the normal operation of the device it is desirable that the wheel 91be rotated a maximum of 60 to each side of a straight ahead position or,in other words, a total of 120, though under certain circumstances alarger range of adjustment may be desired. It may be pointed out thatsaid wheel I05 may be continuously rotated by the motor I08 in theabsence of some stop mechanism. To provide the desirable restrictionabove mentioned I provide a releasable stop mechanism II2 which isillustrated in Fig. 6 of the drawings. This stop mechanism includes aplunger H3 which extends through a yertical bore in'the rim of the capI02 and in its normal position, as illustrated in Fig. 6 of thedrawings, extends downwardly between a pair of stops or lugs, one ofwhich is seen at H4, which stops are formed integral with the rim of thegear I06 and are I spaced 120 apart. The two stops II are so locatedthat when one of them abuts the plunger II3 the wheel I05 will be 60 ina clockwise direction from straight ahead and when the other stop I"abuts the plunger II3 the wheel I05 will be 60 in a counter-clockwisedirection with respect to the straight ahead position. In other words,the plunger II3 cooperates with the two spaced stops H4 to permit freeadjustment of the wheel I 05 to 60 from the aligned straight aheadposition to either side.

It is sometimes desirable, as above noted, to be able to adjust thewheel I05 in excess of 60 and consequently the stop mechanism H2 isprovided with a releasing handle H5 which is pivoted to the frame I0 andat one end is pivotally attached to the plunger II3. A spring I I6biases the handle II5 so that the plunger H3 is normally in stoppingposition. It is obvious that by pushing down on the handle II5 theplunger II3 may be lifted to permit entirely free rotation of the wheelI05. It may further be stated that since the wheel I 05 has no normalposition, in other words, since it may be rotated 180 and in either oftwo positions 180 apart have exactly the same effect, I preferablyprovide two sets of stops II 4 so that should the wheel I05 be rotated180, a new setof stops II4 functioning as above described will come intooperation without requiring the wheel I05 to be reset to its initialposition.

It is, of course, evident that the principal steering of the miningmachine will be by virtue of the steering wheel mechanism 91 which isadjustable about the vertical or upright axis and which may be turned afull 360 though normally is restricted to 60 of turning movement ineither direction from the straight ahead position unless released. Thissteering action may be supplemented, if desired, by operating one of thebrake mechanisms 65 associated with the differential mechanism, as abovedescribed.

The operation of the mining machine while cutting a. kerf or while beingtransported is essentially that described in the above mentioned rib.Furthermore, the pneumatic tire mountingprovides for the readytransportation of the min. ing machine under its own power from oneposition to another in a mine, as for example from one room to anotherwithout requiring the laying of any tracks.

It may also be mentioned that pneumatic tires increase slightly theoverall height of the machine measured with respect to the tops of themine rails and to compensate for this the head section It has beenmodified very slightly by extending its length to insure that the cutterbar Il may cut at a position at least as low as the mine bottom uponwhich the tires 35, 36 and H0 are supported.

It is obvious that the mining machine produced is one which is not onlyuniversal in characterbut is extremely flexible and is easily adjustedor moved to various positions in a mine room at a transportation speedwhere it can be fed under its own power at a slow feeding or sumpingspeed for cutting a kerf. Other means of cutting kerfs by swinging theturntable II,

swingin the supplemental frame I3 or swinging the cutter bar II aboutthe head I6 are believed obvious from a description of the mode ofoperation of the above mentioned patent to R. K. Jeffrey, et 9.1., allof which are preserved in this machine.

Obviously those skilled in the art may make various changes in thedetails and arrangement of parts without departing from the spirit andscope of the invention as defined by the claims hereto appended, and Itherefore wish not to be restricted to the precise construction hereindisclosed.

Having thus described and shown an embodiment of my invention, what Idesire to secure by Letters Patent of the United States is:

1. Drive mechanism including a frame, a differential cage, a pair ofspaced bearings directly mounting said differential cage for rotation onsaid frame, means for driving said differential cage, a pair of drivengears on said cage mounted to rotate relative thereto said gears beingremovable while said cage is mounted on said frame as aforesaid, meansincluding an individual drive shaft connected to drive each of saidgears, and differential gearing connecting said shafts and driven bysaid cage, said driven gears normally rotating with said cage on whichthey are mounted but rotating relative thereto when controlled .bydifferential action.

2. A differential drive mechanism including a frame, a differentialcage, means including a bearing mounting said cage for rotation on saidframe, means for rotating said differential cage, a driven gear mountedon said cage and independently rotatable relative thereto, meansincluding an individual drive shaft extending into said cage andconnected to drive said gear, and differential gearing connecting saidshaft and driven by said cage, said driven gear normally rotating withsaid cage on which it is mounted -but rotating relative thereto whencontrolled by said driven gear and providing for removal of said drivengear while said differential cage is vdifferential gearing in said cageand connected thereto, and means including a shaft extending throughsaid laterally extending portion and connected to said gear, said meansalso including a loose driving coupling between said shaft and gear.

4. A differential including a frame, a cage having a pair of laterallyextending portions, a gear mounted for rotation on each laterallyextending portion of said cage, means including a pair of bearingsmounting said cage for rotation directly on said frame, differentialgearing in said cage and connected thereto, and means includingindividual shafts extending through said laterally extending portionsand connected to said gears, one shaft being individual to each gear,the mounting means for said cage being entirely independent of saidgears mounted thereon.

5. A differential including a cage having a pair of laterally extendingportions, a gear mounted for rotation on each laterally extendingportion of said cage, means mounting said cage for rotation,differential gearing in said cage and connected thereto, and meansincluding individual shafts extending through said laterally extendingportions and connected to said gears, one shaft being individual to eachgear, said means also including a loose driving coupling between eachshaft and gear, each gear having a-brake drum rigidly attached thereto.

6. A differential including a cage having a laterally extending portion,a gear mounted for rotation on said laterally extending portion of saidcage, means mounting said cage for rotation, differential gearing insaid cage and.connected thereto, and means including a shaft extendingthrough said laterally extending portion and con nected to said gear,said means also including a loose driving coupling between said shaftand gear, said gear having an integrally formed brake drum.

7. Drive mechanism including a frame, a differential includin a housing,differential gears in and connected to said housing, spaced bearings onsaid frame mounting said housing for rotation as a unit with thedifferential gears, said frame including an enclosure for one of saidbearings, said differential housing having a portion extending throughopenings in said enclosure, seals between said housing and the walls ofsaid enclosure openings throu h which said differential housing portionextends, means for feeding grease to said enclosure and lubricating thebearing therein, means providingan opening in said differential housingportion within said enclosure whereby grease therein can flow into saiddifferential housing, another enclosure for the other of said bearingshaving openings through which another part of said differential housingextends, seals fOr said openings cooperating with said housing, andmeans providing an opening in said differential housing to provide apath for grease in said housing to said other bearing.

8. Drive gearing including a frame, a differential housing mounted on apair of spaced bearings in said frame, means providing an enclosure forone of said bearings through which said differential housing extends,differential gears within said differential housing, a drive gearjournaled on one end of said differential housing, means for supplyinggrease to said enclosure to lubricate said one bearing, saiddifferential housin having an opening therein within said enclosurewhereby grease therein may flow into said housing and lubricate saiddifferential gears,

means providing a grease passageway through said housing to the other ofsaid spaced bearings, and means providing a grease passageway throughsaid housing to the journal of said drive gear on said housing.

9. Drive gearing including a frame, a differential housing mounted on apair of spaced hearings in said frame, means providing anenclosure forone of saidbearings through which said differential housing extends,differential gears within said differential housing, a drive gearjournaled on one end of said differential housing, means for supplyinggrease to said enclosure to lubricate said one bearing, saiddifferential housing having an opening therein within said enclosurewhereby grease therein may flow into said housing and lubricate saiddifferential gears, and means providing a grease passageway through.said housing to the journal of said drive gear on said housing.

10. In a machine, a frame, a differential, said differential including ahousing and cage, differential gearing in said housing and cage, meansmounting said housing and cage for rotation as a unit with said earingincluding a pair of bearings carried by said frame, one on each side ofsaid housing and cage, a separate enclosure for each bearing andseparate portions of said housing and cage, said housing and cage havingopposite portions each extending through a sealed openin into anindividual bearing enclosure, and means for supplying oil to one of saidhearing enclosures, said differential housing and cage having meansproviding a lubricating path for the oil in said one bearing enclosureto the interior of the differential housing and cage and the gearingtherein and to the interior of the other of said bearing enclosures tolubricate the bearing therein.

ARTHUR L. LEE.

